This book explains the motivations for building and using portfolio tools, and clarifies the principles and practice of using and developing them for assessment, recording personal information, self-presentation, personal and professional development, and for subtler and deeper aims of encouraging a reflective approach to learning, practice and life, developing personal identity, and ethical development towards moral agency. The book also offers a stimulating future vision to orient those with a longer-term perspective on the directions in which portfolio tools and related technology are advancing.